[YARN-4763] RMApps Page crashes with NPE

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.8.0, 3.0.0-alpha1
• Component/s: webapp
• Hadoop Flags: Reviewed
• Assignee: Bibin Chundatt
• Reporter: Bibin Chundatt
• Created: 04/Mar/16 10:03
• Updated: 15/May/17 20:17
• Resolved: 05/Mar/16 07:42

Description

=application_1457010932347_0121
2016-03-04 10:16:27,016 INFO org.apache.hadoop.yarn.server.resourcemanager.security.DelegationTokenRenewer: application_1457010932347_0121 found existing hdfs token Kind: HDFS_DELEGATION_TOKEN, Service: ha-hdfs:hacluster, Ident: (HDFS_DELEGATION_TOKEN token 128 for yarn with renewer yarn)
2016-03-04 10:16:27,029 ERROR org.apache.hadoop.yarn.webapp.Dispatcher: error handling URI: /cluster/apps
java.lang.NullPointerException
        at org.apache.hadoop.yarn.server.resourcemanager.webapp.RMAppsBlock.renderData(RMAppsBlock.java:100)
        at org.apache.hadoop.yarn.server.webapp.AppsBlock.render(AppsBlock.java:140)
        at org.apache.hadoop.yarn.webapp.view.HtmlBlock.render(HtmlBlock.java:69)
        at org.apache.hadoop.yarn.webapp.view.HtmlBlock.renderPartial(HtmlBlock.java:79)
        at org.apache.hadoop.yarn.webapp.View.render(View.java:235)
        at org.apache.hadoop.yarn.webapp.view.HtmlBlock$Block.subView(HtmlBlock.java:43)
        at org.apache.hadoop.yarn.webapp.hamlet.Hamlet._(Hamlet.java:30354)
        at org.apache.hadoop.yarn.server.resourcemanager.webapp.AppsBlockWithMetrics.render(AppsBlockWithMetrics.java:30)
        at org.apache.hadoop.yarn.webapp.view.HtmlBlock.render(HtmlBlock.java:69)
        at org.apache.hadoop.yarn.webapp.view.HtmlBlock.renderPartial(HtmlBlock.java:79)
        at org.apache.hadoop.yarn.webapp.View.render(View.java:235)
        at org.apache.hadoop.yarn.webapp.view.HtmlPage$Page.subView(HtmlPage.java:49)
        at org.apache.hadoop.yarn.webapp.hamlet.HamletImpl$EImp._v(HamletImpl.java:117)
        at org.apache.hadoop.yarn.webapp.hamlet.Hamlet$TD._(Hamlet.java:848)
        at org.apache.hadoop.yarn.webapp.view.TwoColumnLayout.render(TwoColumnLayout.java:71)
        at org.apache.hadoop.yarn.webapp.view.HtmlPage.render(HtmlPage.java:82)
        at org.apache.hadoop.yarn.webapp.Dispatcher.render(Dispatcher.java:197)
        at org.apache.hadoop.yarn.webapp.Dispatcher.service(Dispatcher.java:156)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
        at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:263)

Application state is NEW the apptempts can be empty as per inital analysis

rm.getRMContext().getRMApps()
          .get(appAttemptId.getApplicationId()).getAppAttempts()
          .get(appAttemptId)

Issue Links

• is broken by: YARN-4307 Display blacklisted nodes for AM container in the RM web UI
• is related to: YARN-6603 NPE in RMAppsBlock